I'm working on a MPI
application where I'm using OpenMPI instead of MPICH.

In
my "master" program I call the function MPI::Intracomm::Spawn which
spawns "slave" processes. It is not clear for me how to spawn the "slave"
processes over the network. Currently "master" creates "slaves" on the same
host.

If I use 'mpirun
--hostfile openmpi.hosts' then processes are spawn over the network as expected.
But now I need to spawn processes over the network from my own executable using
MPI::Intracomm::Spawn, how can I achieve it?